tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * shutdown.c - power management functions for the device tree.
3 *
4 * Copyright (c) 2002-3 Patrick Mochel
5 * 2002-3 Open Source Development Lab
6 *
7 * This file is released under the GPLv2
8 *
9 */
10
11#include <linux/device.h>
12#include <asm/semaphore.h>
13
14#include "../base.h"
15#include "power.h"
16
17#define to_dev(node) container_of(node, struct device, kobj.entry)
18
19extern struct subsystem devices_subsys;
20
21
22/**
23 * We handle system devices differently - we suspend and shut them
24 * down last and resume them first. That way, we don't do anything stupid like
25 * shutting down the interrupt controller before any devices..
26 *
27 * Note that there are not different stages for power management calls -
28 * they only get one called once when interrupts are disabled.
29 */
30
31
32/**
33 * device_shutdown - call ->shutdown() on each device to shutdown.
34 */
35void device_shutdown(void)
36{
37 struct device * dev, *devn;
38
39 down_write(&devices_subsys.rwsem);
40 list_for_each_entry_safe_reverse(dev, devn, &devices_subsys.kset.list,
41 kobj.entry) {
42 if (dev->bus && dev->bus->shutdown) {
43 dev_dbg(dev, "shutdown\n");
44 dev->bus->shutdown(dev);
45 } else if (dev->driver && dev->driver->shutdown) {
46 dev_dbg(dev, "shutdown\n");
47 dev->driver->shutdown(dev);
48 }
49 }
50 up_write(&devices_subsys.rwsem);
51
52 sysdev_shutdown();
53}
54